Coffee percolator



D". E. 'DUNLOP COFFEE PERCOLATOR De c, 7, 1948.1

Filed April 2, 1946 INVENTOR. DONALD E- DuNLoP ATTORNEYS Patented Dec. 7, 1948 course rERoo A'roR I a Donald btmlofi," SanTedrd (lal lf. Application April 2, 1946, Serial No; 659,116

. a 1 My invention has to. of the continuous-circulating type, andconsists in certainnovel constructions and arrangements hereinafter described and olaimed l An object of. my invention is to provideameans of continuously circulating thewater in a cofiee percolatcr of the aforesaid. type, without the use of a conventional pipe to conduct the water; from beneath the baseplate of i the .percolator to the inner percolating receptacle. such it a pipe easily becomes stained on the insidewitha deposit of rancid oils and other ;matter,. and;ils inconvenient to clean, it is apt toimpar a dls agreeable flavor to the brewed beverag pipe often is, considered objectionable hygenic standpoint. e t 1; I

In lieu of such a pipe, as usedin the conventionalpercolators, I employ an uprightlplate hav} ing a shallow grooveor channel impressed in it. This groove may be easily inspected and cleaned when the upright plate is removedfrom the main receptacle of the percolator When the upright plate is held against the wall of thepercolator main receptacle, a portionsof the wall will form a cover for the groove. This provides a tubular space through which water may be rnade to circulate in the. same manner that ,it circulates through the central pipe of the conventional percolator. The upright plate is preferablyformed integrally with the base, plate of the percolator, and is in effect 3111 extension ofthe basesplate. Thus both plates may be removedfron themain do with coffee l receptacleof the percolator as a iunit, and allsurfaces thereof are exposed for washing punposes.

l It is further; proposed in thisinvention cprovide means for delivering hot 1 wate orn the main receptacle of the percolator to the mnen receptacle containing the coffee, this! water I being delivered at less than boiling temperature. Thus the desired; oils of thecoffeewillnotbe volatilized and lost- 1. i

Another object resides inwthesprovision ofa base plate of such construction that it {willcause the heated water at the bottom, of; the main receptacle to flow upwardlythrough the groove in the upright plate prior to actual boiling of the water. This heated water is dischargedover the coffee contained in the inner receptacle.

A still further object is to provide novel means for holding thebase and upright plates in proper positions relative to the main; receptacleof; the percolator, and yet permit the ready;.removal of these; plates as a unit: it i 1 H Another object of this invention is to;f acilitate the cheap manufacture of a seamless percolator,

conveyor; thatIemploy; c Figure 4 is a top plan view of the water conas will'be seen to be practicable from the annexed drawings.

Other objects and advantages will appear as the specification continues, and the novel features of my. invention particularly will be set forth in the appended; claims. l e e ,gFora better understandingof the invention, reference should be had to the accompanying drawing, forming, part of this application in which:, 1

figure 1 is a vertical .sectiontaken through a ,coffeepercolator constructed in accordance with y nven n;

broken away to disclose the interior construction;

Figure 3 is a rear elevational view of the water veyor; and

Figure 5;is a vertical section taken along .the

line.V-.-.V ofFigure 2. a H

While I have shown. only the preferred form of. my invention, it should be understood that various changes, or modifications, may be made Within the "scope of the annexedtclaims withou departing from. the spirit thereof.

In. carrying my invention into practice, I provide a main receptacle or potjA which isformed with a pouring spout I and has a suitable handle' 2 securedythereto. The upper part of this main receptacle is fashioned with a substantially annularshoulderj; and an inwardly-extending flange 4; is larrangedqabove this shoulder; An

.6,is1a'dapted for holding the coffee 1 from which spout the flavor is tobe extracted. InFigures land 5, I; disclose this receptacle ashaving vertical wall portions 8 that bear against the inner surface 9 of the main receptacle A. c This arrangement prevents lateral shiftingof the receptacle B relative neath the flange {for securing the lid in place over the inner receptacle B. In Figure 2, I have illustrated a notch .,l3 ,lwhich is formed in the flange t in [diametricallyopposed relation with respect to the spout I. In assembling the lid or cover C upon the main receptacle A, the projections I2 are aligned with the spout I and the notch I3. Thereafter, the lid is pressed downwardly until the projections I2 are disposed below the annular flange 4. The lid now is turned and the projections I2 will engage under the flange 4, thus removably retaining the lid in place.

In order to. transfer hot water fromthe lower lating receptacle B, I have provided a water conveyor, indicated generally at D. The latter in: cludes a base plate l4 and an upright plate I5 The base plate has a concave under 'sii'fifiale F6 Thus the pressure in the space or passageway 23 is built up until it will overcome the skin tension. At this point, the column of water in the space or passageway 23 will spout upwardly and discharge into the inner receptacle B. Thus delivery of heated water to the cofiee I is periodical.

It will be noted that the upright plate I5 is provided with wings 29, whichlare arranged on ppasae :ifiies oi the groove or'hhannel 22. These wings are curved in top plan view (see Fig- ;ures 2 and 4) so as to conform to the inner surface 9 of the main receptacle. A plurality of '%f6o"v 's ma, 30b, 30c and 30d are formed in each and the marginal edge ll of this basegplate rests .15 of these wings and extend throughout the height upon the bottom I8 of the mamreesptaie and bears against the front wall partidffof the latter'. The water I9 in the receptacle A may enter the 7 space beneath the base -plate I 4 through "65am ings 20. These openings may be omitted, if dearea, sine-e aieavatertnrfiaw iiridi'r tl'ie iiiarginal edge I land gain access to the space "21 formed b'er'iath pa e elate. I A's previously riientidhed tli has a shallow groove "or *cli'slrinel 22 mi'pre "e therein. When the water conveyfihD i's 'posh enes Within the iiiaiii reeefitaeie A; the *wall pr'tibh 913 *of the latter fof-ihs -"'a-%over f'6r the "groove. pib'iiids a vrtih'a'l t'riiiiular geese or passageway 23, which communicates warren the biitlt 2-4 of ase ease plate atits =40 and eritrthewerticalfiacehr passageway 2'3.

heated Water'inf tl'ie passageway "will be ais'ehaigeq period-teeny "over the upper end arrows '21, use will preia its'eir ever "the entree 1 wat-aims m- "the in er ree pracie =13. underneath surface "-28 ofthe' lid 6r (were is suitably "designed to caus"e tire wa er to spread *over "the coffee 1. Fir-"n nea er the lm extendsbeybnetnetubiiiarpassagway ia"(see ng '80 "iii'ftliela'ttei. 'Of course, these grooves are filled with Water to the level I9a in the main receptagle A. Any hot water tending to escape nceranynom the groove or channel 22 initially will be trapped in the grooves 30a, wherein a tiiibiilii't atitiiiwilltle' setup "seawater alresisy ahese*%iodvs,aetmg 't' *pede 'rurmr newer th'e hot 'wat'r toward-12h gisdves aub. In the event c-har es er should escape totlie g eaves 30b; tlie -tu'i biilen'c'e arest; -m the P latter 'ti'oh Qif vertiem i ibs opposite eaten 6f the grooves hriliers'to'cid. In operating this device, the base II front portion of the marginal edge I! rests against the front wall of the main receptacle. Next, the lid or cover 0 is introduced into position and the projections 12 are engaged under the flange 4.

The parts being thus arranged, the groove or channel 22 in the upright plate I5 becomes in effect a tube, communicating with the space 2| beneath the base plate l4. Upon heating the bottom 18 of the main receptacle, hot water will be forced periodically upwardly through the space or passageway 23 and discharged over the c-oifee contained in the inner receptacle B.

The Water delivered over the coifee 1 will have a temperature within the approximate range, of 200-205 Fahrenheit, and will drain out of the perforations B, which are formed in the inner receptacle. Recirculation of the Water should be continued until the brewed coffee has the desired strength.

When the lid C, inner receptacle B and the water conveyor D are removed fromthe main receptacle A, all surfaces of these parts and the main receptacle are exposed for easy washing and cleaning. r

I claim:

1. In a coffee percolator, a main receptacle, a base plate resting on the bottom of the main receptacle and having a concaved under surface coacting with the main receptacle in forming a water-heating space, an upright plate extending from the base plate and having a groove fashioned therein communicating with the water-heating space, the upright plate being disposed to bear against the inner wall of the main receptacle so that a portion of the latter will form a cover over the groove and provide a tubular passageway extending upwardly from the waterheating space to a point of discharge, and an inner coffee-holding receptacle arranged to receive hot water discharging from the tubular passageway when Water is heated in the space beneath the base plate, the base and upright plates being removable from the main receptacle whereby all surfaces of these plates may be inspected and cleaned, the upright plate having wings thereon shaped to bear against the inner surface of the main receptacle, the Wings having vertically-extending grooves fashioned in the face thereof which bears against the inner surface of the main receptacle and designed to im-- pede lateral flow of water from the tubular passageway.

2. In a colfee percolator, a main receptacle, a base plate resting on the bottom of the main receptacle and having a concaved under surface coacting with the main receptacle in forming a Water-heating space, said base plate having an upright plate extending therefrom and having a groove fashioned therein for communicating with the water-heating space, the upright plate hav ing Wing portions arranged along each side of the groove for contacting the inner wall of the main receptacle for preventing lateral movement of any liquidthat moves upwardly in the passageway formed by the groove and the adjacent wall portion of the receptacle, an inner coffeeholding receptacle removably carried by the main receptacle and abutting the upright plate and having an open top arranged to receive Water discharged from the passageway when water is heated in the space beneath the base plate, and a cover for the main receptacle and having a curved under surface for guiding Water from the passageway into the top of the coffee-holding receptacle,said base plate and upright plate being removable as a unit from the main receptacle, whereby all surfaces of these plates may be inspected and cleaned.

DONALD E. DUNLOP.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 203,275 Hunt May 7,1878 412,138 Terrell Oct. 1, 1889 630,761 Wilmot Aug. 8, 1899 1,276,774 Kuhn et a1 Aug. 27, 1918 2,334,752 Clapp et a1 Nov. 23, 1943 

